Improved fdeiaoes foe hot-aie blast



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RICHARD LONG,y OF CHILLIOOTHE, OHIO. Lena-3 Parmi No. 72,056, dansDecember 1o, 1867.

IMPROVED PURNAGES FOR HOT-AIB. BLAST.

TO ALL WHOM IT MAY CON CERN Be it known that I, RICHARD LONG, ofChillicothe, in the county of Ross., and State of Ohio, haveinvented Vanew and improved Furnace Hot-Air Blast; .and I do hereby declare thatthe following is a full, clear, and

exact description thereof, which will enable those skilled in theart tomake and use the same, reference being had to the accompanyingdranrings, forming part o'f this specification.

This invention relates to a new and improved method of constructing andarranging the air-pipe for heating the air-blast for furnaces forsmelting. and reducing the ores in the manufacture oiron, havingparticular reference to the materials of which the nir-pipe is formed,the method of itsconstruction, and also to the materials and method ofconstruction of the supporting walls; and'tlie invention consists mainlyin making the air-pipe of {ire-clay, and of an oval form, and inluniting the sections of which the pipe isA composed by socket-jointsclamped and keyed together, whereby leakageis prevented, land expansionand' qbntraction are provided for, and the apparatus rendered veihcientand durable, as will be hereinafter ,more fully described.

Figure 1 represents an end elevation of the air-pipe supported` bysuitable Walls, with the outside casing removed. i

Figure 2 is a horizontal section 'of theapparatus, showing the columnswhich support Vthe vchimntay-stack, and the Walls which support theair-pipe, the section being through the line-y y of fig. 1.

Figure 3 is a vertical sectional elevation, the section being on theline a; a: ofg. 1.

Similar letters of reference indicate corresponding parts. i i

This apparatus is placed near the furnace-stack, and the heat dischargedfrom the top of the stack `in the process of smelting ores `is conveyedinto this apparatus beneath the air-pipe, passing upwards through andbetween the sections of the pipe into the chimney which is built upon itand supported by it, so'that the blast is heated by the combustible andburning-gases which escape from the stack. Utilizing this heat for thisand other purposes is by no means ner: with me. Steam is generated by itfor blowing the blast as well asheating it in many establishments.

In arrangements of this kind heretofore used, the heating or blast-pipeand the supporting walls have been made of iron, and being subject toconstant expansion and contraction, they soon become cracked and unfitfor use. By making the pipe of {ire-clay and the supporting walls offire-brick and plates of metal, I overcome all objections in consequenceof expansion and contraction, and render the apparatus durable and notliable to get out of order.

Referring to the drawing, A represents the blast-pipe, B the supportingwalls. C represents the main supporting pillars for the chimney, whichare of iron. The air-pipe and the supportingwalls are enclosed by acasing, marked D, which may be either metal or masonry. To the pillarsC, doors E lare hinged, to give access to the interior upon each side,as seen in the drawing. As seen, the form ofthe air-pipe is oval, theadvantage of which form is that it affords less surface for ashes torest upon than a ound pipe would. The ashes being a Vnon-conductor,interfere materially with the heating of the blast when resting upon thepipe. The pipe is made in sections, which are united by semicircularpipes or rmove-necks, and the joint, (as seen at F, fig. 3,) is asocket-joint, the flanges being united by clamps and keys, as seeninfig. 1 at g. The pipe passes andre-passes back and forth in a windingor sinuous form in layers or tiers, connected together by thesemicircular pipes, as seen in iig. 1. The interior of the pipe forms acontinuous channel for the air, unbroken by any angles or corners. Theair enters the lower-tier at At, and after passing through the pipe isdischarged at J, from whencc it is conducted to near the bottom of thestack in the usual manner. The supporting walls are made of (ire-brick,which are ttcd to the pipe, cach tier of Abricks having an iron plate,marked f, which separates the tiers or courses of brick, as seen in-thcdrawing. 1t will thus be seen that all thc parts which are exposed tothe more intense heat from the iiame of the burning gases areconstructed of {ire-clay and lire-brick, and so arranged that theexpansion and contraction by the variations of temperature do not injureor affect them. Beneath the airpipe A there is a plate, marked H, whichrests on cleats When the heater is in operation, an open or perforatedplate is employed to check and spread the flame, thereby diffusing itmore uniformly under the pipe. In cases of accident or stoppages fortemporary repairs outside the heater, a solid plate may be employed toclose tho space beneath the pipe entirely, for the purpose'oi` retainingthe heat and excluding the cold air. On thc top of the apparatusthere isanother check-plate, G, upon which the chimney rests, the orificethrough which is so contracted that the heat is retarded around thepipe, and not allowed to have a. free dischargeinto the chimney,

as is usual: A

I claim as new, and desire to secure by Letters Patent- 1. Constructinglthe air-pipe of a furnace-blast heater of fire-clay, 'substantially :1sdescribed;

2. Constructing the air-pipe of an oval or other equivalent form, and'unit-ing the sections of which it is composed by socket-joints, withclamps and keys, substantially as shown and described.

l 3. Forming the supporting walls B of fire-brick, with iron platesbetween 'tho courses, and substantially` as shown and described. v

4. Placing an open or solid plate beneath the :tir-pipo, substantiallyas and for the purpo sesherein described.

The above specication of my invention signed by me, this 7th day ofOctober, 1867.

RICHARD LONG;

i Witnesses: A

WM. F. MCNAMARAZ ALEX. F.`RoBERTs.

